You found a bank offering the following rates:

USDIDR $14,405$ USDBRL $5\mathrm{.}2542$

a$.$ What is the correct cross rate in terms of BRLIDR?

b$.$ Suppose instead you found another bank offering you a rate of BRLIDR $2600.$ You have a line of credit at the bank of $$5,000,000.$ What do you do$?$ How much is your profit?